| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bret Saberhagen | KCA | 10.46 | 198909300_KCA_OAK |
| Mark Langston | WAS | 3.31 | 198909290_WAS_PHI |
| Chuck Finley | ANA | 3.27 | 198909300_TEX_ANA |
| Rick Reuschel | SFN | 3.07 | 198909300_SFN_SDN |
| Jose DeLeon | SLN | 1.67 | 198909300_CHN_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bobby Witt | TEX | -6 | 198909290_TEX_ANA |
| Andy Hawkins | NYA | -2.91 | 198909300_DET_NYA |
| Mike Witt | ANA | -1.94 | 198909290_TEX_ANA |
| Jack Morris | DET | -1.88 | 198909290_DET_NYA |
| Don August | MIL | -1.56 | 198909280_MIL_BOS |
Based on accumulated WAA for this season up to 1989-09-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 9.72 | Bret Saberhagen | 263 | KCA |
| +006+ | 7.18 | Orel Hershiser | 246 | LAN |
| +010+ | 6.36 | Scott Garrelts | 193.7 | SFN |
| +011+ | 6.25 | Mike Moore | 242 | OAK |
| +016+ | 5.71 | Bruce Hurst | 245.3 | SDN |
| +019+ | 5.58 | Mark Langston | 251.3 | TOT |
| +020+ | 5.43 | Bert Blyleven | 241 | ANA |
| +021+ | 5.41 | Chuck Finley | 199.3 | ANA |
| +022+ | 5.4 | Ed Whitson | 227 | SDN |
| +030+ | 4.7 | Bryn Smith | 210.7 | WAS |
| +031+ | 4.66 | Doug Drabek | 245.3 | PIT |
| +032+ | 4.66 | Chris Bosio | 235 | MIL |
| +036+ | 4.39 | Tim Belcher | 230.3 | LAN |
| +040+ | 4.2 | Joe Magrane | 234.7 | SLN |
| +042+ | 4.11 | Sid Fernandez | 211 | NYN |
| +044+ | 4.05 | Greg Maddux | 238.3 | CHN |
| +045+ | 4.04 | Mark Gubicza | 255.7 | KCA |
| +046+ | 4.03 | Kirk McCaskill | 207.7 | ANA |
| +049+ | 3.87 | Mike Morgan | 152.3 | LAN |
| +051+ | 3.82 | John Smiley | 205.3 | PIT |
| +063+ | 3.63 | Rick Reuschel | 208.3 | SFN |
| +066+ | 3.53 | Jose DeLeon | 244 | SLN |
| +067+ | 3.5 | Bob Welch | 210.3 | OAK |
| +069+ | 3.41 | Rick Aguilera | 144.7 | TOT |
| +072+ | 3.33 | Todd Burns | 96.7 | OAK |
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